<template>
    <div>
        <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
       <!-- tab栏区域 -->
       <el-tabs v-model="activeIndex" :tab-position="'left'" 
        :before-leave='beforeTabLeave'
        @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name='0'>
           <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
             <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
             <el-form-item label="商品分类" prop="goods_cat">
               <!-- 级联选择器 -->
              <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
              </el-cascader>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name='1'>
          <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border size="mini"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name='2'>
           <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name='3'>
           <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name='4'>
          <!-- 富文本编辑器组件 -->
            <quill-editor
              v-model="addForm.goods_introduce"
            />
             <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
       </el-form>
    </el-card>
   
    <!-- 图片预览区域 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>

    </div>
</template>
<script>
// 导入 lodash 依赖
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex:"0",//"0"-0 为数值(tab栏与步骤条的联动值;一个需要字符串，一个需要数字)
            // 添加商品的表单数据对象
            addForm: {
              goods_name: '',
              goods_price: 0,
              goods_weight: 0,
              goods_number: 0,
              // 商品所属的分类数组
              goods_cat: [],//提交时需要转为,分割的字符串(但是级联选择器中必须是数组)
              // 图片的数组
              pics: [],
              // 商品的详情描述
              goods_introduce: '',
              //商品的参数（数组），包含 动态参数 和 静态属性
              attrs: []
            },
             addFormRules: {
              goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' }
              ],
              goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' }
              ],
              goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }
              ],
              goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' }
              ],
              goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' }
              ]
            },
             // 商品分类列表
           catelist: [],
           //级联选着器参数
            cateProps: {
            label: 'cat_name',
            value: 'cat_id',
            children: 'children'
          },
           // 动态参数列表数据
          manyTableData: [],
          // 静态属性列表数据
          onlyTableData: [],
           // 上传图片的URL地址
          uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
          // 图片上传组件的headers请求头对象
          headerObj: {
           Authorization: window.sessionStorage.getItem('vue_shop_token')
         },
        previewPath: '',//图片真实路径
        previewVisible: false ,//是否显示预览
        }
    },
    created() {
      this.getCateList();
      
    }
    ,methods: {
      //获取所有商品分类的数据
      getCateList(){
       
             this.$my_http({
                 method:"get",
                url:`categories`
                }).then(res => {
                        
             if(res.data.meta.status != 200){
               this.$message.error(res.data.meta.msg);
               }else{        

                  this.catelist =res.data.data
                //  console.log(this.catelist)
               }
               }) 
      },
       // 级联选择器选中项变化，会触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      //只能选择三级
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
  
      }
    },
    //tab标签切换
    beforeTabLeave(activeName, oldActiveName){
        // console.log('即将离开的标签页名字是：' + oldActiveName)
      // console.log('即将进入的标签页名字是：' + activeName)
      // return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false  //阻止切换
      }
    },
    //tab标签点击事件
    tabClicked(){
       // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
        if (this.activeIndex === '1') {
         this.$my_http({
             method:"get",
             url:`categories/${this.cateId}/attributes`,
             params: { sel: 'many' }
            }).then(res => {
                
           if(res.data.meta.status != 200){
             this.$message.error(res.data.meta.msg);
             }else{        
               console.log(res.data.data)
                res.data.data.forEach(item => {
                  item.attr_vals =
                    item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');//分割数组
                })
                this.manyTableData = res.data.data
               }
             })
        }else if (this.activeIndex === '2') {//静态参数面板
          this.$my_http({
             method:"get",
             url:`categories/${this.cateId}/attributes`,
             params: { sel: 'only' }
            }).then(res => {
                        
           if(res.data.meta.status != 200){
                this.$message.error(res.data.meta.msg);
             }else{        
               console.log(res.data.data)
                  this.onlyTableData = res.data.data
               }
             })
        }


     },
       // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // console.log(file)
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path } //图片存储路径
      // 2. 将图片信息对象，push 到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    //添加商品
     add(){
        console.log(this.addForm)
        //表单验证
      this.$refs.addFormRef.validate( valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj) 
        //安装lodash运行依赖
        const form = _.cloneDeep(this.addForm) // 深拷贝对象
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
         this.$my_http({
             method:"post",
             url:`goods`,
             data: form
            }).then(res => {
                        
           if(res.data.meta.status != 201){
                this.$message.error(res.data.meta.msg);
             }else{        
                this.$message.success('添加商品成功！')
                 this.$router.push('/goods') //跳转路由
               }
             })


      })
     },

    },
    //计算
    computed: {
     //获取商品分类的id (第三级)
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },

  }
}
</script>
<style lang="less" scoped>
//复选框
.el-checkbox {
  margin: 0 10px 0 0 !important;//上 右 下 左
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>